When the coolant has been low and the temp guage spikes up even after topping off, its a classic example of air pockets in the system and not a failed thermostat (though it could also be suspect on an older car). If your pump is leaking, I would not run the car untill it has been replaced - M96 engines are susceptable to high temperatures....
Use the search function for water pump failures / installation procedures - you will be reading for quite a while.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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